CVE-2026-89780
Status: ReceivedUnscored—
In the Linux kernel, the following vulnerability has been resolved:
net: qualcomm: rmnet: restore skb->dev on deaggregated frames
rmnet_map_deaggregate() allocates each sub-frame with alloc_skb() and leaves skb->dev NULL. __rmnet_map_ingress_handler() assigns skb->dev = ep->egress_dev only on the data path, but a MAP command frame is dispatched to rmnet_map_command() before that, so rmnet_map_send_ack() runs netif_tx_lock(skb->dev) on a NULL device. An unprivileged user reaches this by unsharing a user+net namespace, creating an rmnet link over a tap device with INGRESS_DEAGGREGATION and INGRESS_MAP_COMMANDS, and writing an aggregated frame carrying a flow-control command to the tap fd.
Read full descriptionShow less
Restore the assignment dropped by 378e25357ac7, so every skb leaving rmnet_map_deaggregate() has a valid device.
Technical details traces, logs and code from the original report
BUG: KASAN: null-ptr-deref in _raw_spin_lock (kernel/locking/spinlock.c:158) Write of size 4 at addr 00000000000004b4 by task exploit/144 Call Trace: _raw_spin_lock (kernel/locking/spinlock.c:158) netif_tx_lock (net/sched/sch_generic.c:497) rmnet_map_command (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c:67) rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:125) __netif_receive_skb_core.constprop.0 (net/core/dev.c:6103) ... __netif_receive_skb_one_core (net/core/dev.c:6214) netif_receive_skb (net/core/dev.c:6474) tun_get_user (drivers/net/tun.c:1966) tun_chr_write_iter (drivers/net/tun.c:2012) vfs_write (fs/read_write.c:687) ksys_write (fs/read_write.c:739) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.22%
- Percentile among all scored CVEs: 11
- Score date: 10/4/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
- https://git.kernel.org/stable/c/200460a0793dc6af97d3b36d92ac245350ac26fc
- https://git.kernel.org/stable/c/4bcef54e4a3355a62d9ad90729fe563435ec76c3
- https://git.kernel.org/stable/c/5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd
- https://git.kernel.org/stable/c/7abe769e72c792e5f9eb273813eb3ecd8389854c
- https://git.kernel.org/stable/c/9b78ab84ddf97c06a8567edb62b6c0fd582f9a62
- https://git.kernel.org/stable/c/9d18c6c6cd1666b2cb7915cad052e22abf520997
- https://git.kernel.org/stable/c/a66734a1c5e36525ea07e9f4547fddc51e916de3
- https://git.kernel.org/stable/c/b14c22c31d9e30f38ea1693ac06d318f32258f5d
Raw JSON (NVD)
Show
{
"id": "CVE-2026-89780",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "9b78ab84ddf97c06a8567edb62b6c0fd582f9a62",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "9d18c6c6cd1666b2cb7915cad052e22abf520997",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "4bcef54e4a3355a62d9ad90729fe563435ec76c3",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "b14c22c31d9e30f38ea1693ac06d318f32258f5d",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "7abe769e72c792e5f9eb273813eb3ecd8389854c",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "200460a0793dc6af97d3b36d92ac245350ac26fc",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "a66734a1c5e36525ea07e9f4547fddc51e916de3",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-16T09:17:08.520",
"references": [
{
"url": "https://git.kernel.org/stable/c/200460a0793dc6af97d3b36d92ac245350ac26fc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4bcef54e4a3355a62d9ad90729fe563435ec76c3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7abe769e72c792e5f9eb273813eb3ecd8389854c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9b78ab84ddf97c06a8567edb62b6c0fd582f9a62",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9d18c6c6cd1666b2cb7915cad052e22abf520997",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a66734a1c5e36525ea07e9f4547fddc51e916de3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b14c22c31d9e30f38ea1693ac06d318f32258f5d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: restore skb->dev on deaggregated frames\n\nrmnet_map_deaggregate() allocates each sub-frame with alloc_skb() and\nleaves skb->dev NULL. __rmnet_map_ingress_handler() assigns\nskb->dev = ep->egress_dev only on the data path, but a MAP command frame\nis dispatched to rmnet_map_command() before that, so rmnet_map_send_ack()\nruns netif_tx_lock(skb->dev) on a NULL device. An unprivileged user\nreaches this by unsharing a user+net namespace, creating an rmnet link\nover a tap device with INGRESS_DEAGGREGATION and INGRESS_MAP_COMMANDS,\nand writing an aggregated frame carrying a flow-control command to the\ntap fd.\n\nRestore the assignment dropped by 378e25357ac7, so every skb leaving\nrmnet_map_deaggregate() has a valid device.\n\n BUG: KASAN: null-ptr-deref in _raw_spin_lock (kernel/locking/spinlock.c:158)\n Write of size 4 at addr 00000000000004b4 by task exploit/144\n Call Trace:\n _raw_spin_lock (kernel/locking/spinlock.c:158)\n netif_tx_lock (net/sched/sch_generic.c:497)\n rmnet_map_command (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c:67)\n rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:125)\n __netif_receive_skb_core.constprop.0 (net/core/dev.c:6103)\n ...\n __netif_receive_skb_one_core (net/core/dev.c:6214)\n netif_receive_skb (net/core/dev.c:6474)\n tun_get_user (drivers/net/tun.c:1966)\n tun_chr_write_iter (drivers/net/tun.c:2012)\n vfs_write (fs/read_write.c:687)\n ksys_write (fs/read_write.c:739)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n Kernel panic - not syncing: Fatal exception in interrupt"
}
],
"lastModified": "2026-09-16T09:17:08.520",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}